Updating from Camlp4 to extension points

[scemama]

Hi, I have plenty of code that uses sexplib, but I can't figure out how to modify it such that it works with ocaml > 4.03.

This is what I have done (using ocamlbuild):

• Remove -syntax camlp4o from the ocamlbuild command line
• Changed all the with sexp by [@@deriving sexp] in all the .ml and .mli files
• Removed sexplib.syntax from the packages in the _tags file

But now I get an error:

Error: Unbound value t_of_sexp

And I don't know what to to next. I am completely stuck.

I was not able to find on the web a procedure to modify the code from the old way to the new way of using sexplib. I think it would be very useful if you could write all the steps in .md document in this repository.

Thanks in advance for your help.

Anthony

[agarwal]

You don't mention adding ppx_sexp_conv as a required package. Maybe that's the problem.

Also see https://github.com/janestreet/camlp4-to-ppx. This tool will convert all your source code automatically, but you still have to fix your build configuration.

[scemama]

You are right, ppx_sexp_conv is missing. Thanks for the link, I didn't find it when googling. This will solve my problems. Cheer, Anthony